"I am begging, begging anyone who can hear us to save us from dying," Carmen Yulin Cruz, San Juan's mayor, said Friday morning. "If anybody out there is listening to us, we are dying, and you are killing us with the inefficiency."

Cruz also implied that Puerto Rico had received far more help from corporations and private entities than from the federal government.

"This is what we got last night: four pallets of water, three pallets of meals and 12 pallets of infant food — which I gave them to the people of Comerio, where people are drinking off a creek," Cruz said. "So I am done being polite. I am done being politically correct. I am mad as hell. So I am asking the members of the press, to send a mayday call all over the world. We are dying here."

Trump responded shortly after, criticizing Cruz's leadership ability in a Saturday morning tweetstorm. He made the remarks while staying at his golf club in Bedminster, New Jersey.

"The Mayor of San Juan, who was very complimentary only a few days ago, has now been told by the Democrats that you must be nasty to Trump," Trump said on Twitter. "...Such poor leadership ability by the Mayor of San Juan, and others in Puerto Rico, who are not able to get their workers to help."

Hurricane Maria left many of Puerto Rico's 3.4 million US citizens without shelter, water, power, and other basic necessities.

"They want everything to be done for them when it should be a community effort. 10,000 Federal workers now on Island doing a fantastic job," Trump said on Saturday. "The military and first responders, despite no electric, roads, phones etc., have done an amazing job. Puerto Rico was totally destroyed."

Trump's response to Cruz's appeals for help earned immediate and sustained criticism, particularly from Democrats and celebrities, who blasted the president for attacking the mayor of a hurricane-ravaged city from the confines of his golf course.

Cruz issued a swift response to Trump's tweets. "I'll say what I have to say to save Puerto Rican lives," Cruz said on Saturday morning.

Lin-Manuel Miranda, the creator of "Hamilton" and a frequent advocate for Puerto Rico, told Trump he was "going straight to hell" for his attacks on Cruz.

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"Don't ever let this become normalized," Democratic Sen. Chris Murphy wrote in response to Trump's tweets.

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Sen. Ed Markey of Massachusetts said that the first thing Trump should do when he visits Puerto Rico on Tuesday is apologize for his comments.

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Prominent conservative commentator Erick Erickson wrote that he had planned to speak out in Trump's favor Saturday morning but that he had deleted the blog post. "He doesn't deserve it," Erickson wrote.

"I this it's clear where the 'poor leadership' lies @realDonaldTrump Puerto Rico is part of the United States," tweeted Lady Gaga. "This is our responsibility."

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The artist also made a reference to Trump's frequent preoccupation with recounting his Electoral College victory in November, and implied that he was slow to respond to Puerto Rico because it does not have any Electoral College votes.

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Comedian and talk show host Ellen DeGeneres chimed in with her own message of support for San Juan's mayor. "I see you, I hear you, I love you," DeGeneres tweeted. "You're a hero."

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California Rep. Ted Lieu, a vocal Trump critic, called on the president to send help to Puerto Rico "before you golf."

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Kim Kardashian weighed in and asked Trump to "stop tweeting & golfing while people are dying" and to "please step up & help!"

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Kumail Nanjiani, a stand-up comedian and one of the stars of HBO's "Silicon Valley," observed that Trump "never talk this way about a predominantly white community."

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Others also noted the racial implications of Trump's comments. Data journalist Nate Silver wrote that "it totally fits the pattern that Trump is attacking the mayor San Juan. She challenged him and she's a woman (and Hispanic, obviously.)."

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"The irony of Trump golfing and tweeting—saying the mayor of San Juan wants “everything to be done for them”—it’s as thick as his skull," tweeted Star Trek alum George Takei.

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Actor Chris Evans outlined "a Trump thread in a time of crisis" and called the president "narcissistic," "defensive," and "insulting."

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Several observers noted that Trump was slamming San Juan's mayor from the comfort of his golf course.

Another journalist juxtaposed photos of where Cruz and Trump are currently spending their time. One showed Cruz wading waist-deep into a flooded area in Puerto Rico, and the other depicted Trump's lavish golf resort.

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Ian Millhiser, an editor at the left-leaning outlet, ThinkProgress, tweeted, "When all of this is done I hope Trump is sentenced to live in the most devastated neighborhood in San Juan."

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Politico's Josh Dawsey said that Trump's attacks on Cruz were part of an established trend. "Are you all surprised Trump took a swing at San Juan's mayor? She criticized him. The pattern is pretty much tried-and-true, no matter," Dawsey tweeted.

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"The situation is also dire in the US Virgin Islands," said former Bush White House ethics lawyer, Richard Painter. "But at least he's enjoying his golf game."